Air craft control surface control



March 1, 1932. QE STR 'E-r AL 1,848,013

' 'AIIIRCRIAFT CONTROL suRFAcEEoNTRop I Filed April '9, 1930 9 J I 8 A By EM, $512M A TTORNEY' I HAROLD D. HoEKs'r-RA AND EVERT c. HoKAnsoN,- .;oF GLENDALE, oHIo, AssIGNons-r0 Patented Mar. 1, 1932 UN T D STATES IPOWEL CROSLEY, JR., 015 CINCINNATI, OHIO v AIR CRAFT CONTROL sun-Fact: coiv'rnon Application filed April 9,

Our invention relates to aileron elevator and rudder'controls for airplanes which arev Further, controlling mechanism which is external tends to build up air resistance in the air stream, which is undesirable from the point of view of the efliciency of the mech-' anism. v r

It is the object of our invention to provide improvements in control surfacecontrols in which the operatingmechanism is within the stationary member or wing, thus reducing the air resistance in the air streainj It is a further object of our'invention to allow the use r of a control surface having torsional rigidity,

V nection between the torque member and thepermitting efficient use of the cover material. 'Another object is the provision of controlling mechanism whichpermits'diiferential motion of the control surface.

"The above objects and other objects to which reference willbemade in the ensuing disclosure, we accomplish by that certain combination and arrangement of parts of which we have illustrated a preferred embodiment.

In the drawings 'Figure 1 is a plan View of th t l mechanism applied to the aileron of an aircraft-1' V t Figure 2' is an end view, taken along the lines.2-2 of Figure 1,showing diagrammatically the mechanical principle involved in our preferred control mechanism.

Figure 3 is a perspective view of the conmain control shaft. 7

As indicated in the figures, the airplane wing is indicated at land the aileron is inarm-12. The arm-12 hasapivot 13 withthe "with respect to the torquemembe rs 8 and 14. Since the control surfaceneed not belan 'we claim as new and desire dicatedatQ; I Ne'hav'e indicatedat 3 the inner end of the control surface member or aileromwhich is provided with a'slot 4 within whichfis seated a roller '5 mounted on a shaft Gsecured in theend-of a crank arm' 7"which extends from the-torque rod8'. W e have-coimected with afpivot connec tion 9 an arm lOto the rod '8." In thegarni 10 is ajoint which connects the arm lO with the aileron control tube- 1 i which extends to the pilots driving position and is suitablycon I nected with the-stick;

Thea rm' 10 is connected with the arm 12, as *noted, with the joint 11, which may be a ball and socket joint, a universaljoint, or a self-aligning ball bearing." The'ar'm 121s attached to the controlmember 14- by means essarily'intersecting the center line of rot a' tion of the control member. 1 The aileron hinge line is indicated at 15, i and it will be noted that a continuation of the hinge lineof the aileron does not intercept the hinge or pivot line 16 ofthe axis of the torque member 8; Since the hinge line of a pivot, the'center 'lineof'rotation of which 15 substantially perpendicular to, but not'necit 15 is at the top surface 'of the wing, if the torque member of the-controlling mechanism operated on. a continuati'onjof this line the control mechanism would necessarily be ex posedand cause'air resistance, but since the hinge line of the tOrqueniemberS is eccen trio to the hinge line of thealleron, all-this mechanism maybe enclosed within the wing structure.

e Differential action of the surfaces maybe obtain'edby proper curvature ofthe slot 4 7 and/or positioning of the arms 10 and 12 aileron, asthe construction shown is equally useful for controlling an elevator or rudder,

in the claims we shallrefer to the control a surface as being hinged to a stationary mem- 95 her, be this the wing or other stationary part of the aeroplane body.

Having thus described our invention, what to secure by LettersPatent, is: x

1. In combination With a control surface in an airplane, mechanical means for controlling said surface comprising a torque member having a crank arm having a sliding m connection With said surface, said surface being hinged to a Wing of the airplane, and the axis of the torque member being substantially parallel and offset relative to the hinge line of said surface, said airplane having'a wing Within Which said torque member ex.- tends. a

2. In combination with a control surface in an airplane, mechanical'means for controlling said surface comprising a torque member having a crank arm having a sliding connection with said surface, said surface beinghinged vto a Wing of the airplane, and the axis of the torque member being parallel and offsetrelative to-ithe hinge line of said surface, a control member and pivotedarms, connecting said torque member and said control member having a joint between said pivoted arms.

7 3. In-combination With a stationary mem- 25 her of an airplane having a control surface hinged thereon, control. mechanism for actuating said control surface comprising a torque member axially disaligned from the hinge, line of said surface, said surface having a slot in one end thereof, and said torque member having a member slidably mounted said slot, said member comprising a roller mounted in axial parallel alignment With said torque member on a crank extending from said torque member.

4. In combination With the Wing a stationary member of an airplane having a control surface hinged thereomcontrol mechanism for actuating said control surface comprising a torque member havinga crank arm extending therefrom, and said crank arm having a cam slot and cam rider connection With said control surface, said control surface havinga stiffened end wall having said camslot formed therein.

5. In combination With a stationary imember of an airplane having a control surface hinged thereon, control mechanism for actuating said control surface comprising a torque member having a crank arm vextending therefrom, and said crank arm having a cam slot and cam rider connection'with said control s urface, -said control surface having 55 a stiffened end wall having said cam slot formed therein, and sald cam rider compr sing a roller mounted on and extending at right angles toathe end of said crank.

HAROLD D. nonns'rn if nvnnr o. HOKANSON. 

